Model

<!ENTITY % source-elements
                        "| %abbrev.class; |
                         %address-link.class; |%emphasis.class; |
                         %inline-display.class; |
                         %inline-math.class; | %math.class; |
                         %phrase-content.class; | 
                         %simple-link.class; | %subsup.class;"       >

Expanded Model

| abbrev | email | ext-link | uri |bold | fixed-case | italic | monospace | overline | roman | sans-serif | sc | strike | underline | ruby | alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math | named-content | styled-content | fn | target | xref | sub | sup